Hand type staple tacker



Nom 17, 1953 F. s. BoRbuGHs HAND TYPE STAPLE TACKER 4 Sheets-Sheet 1 Filed Jan. l5, 1951 INVENTOR. FRANK S. BROUGHS ATTORNEY F. S; BOROUGHS HAND TYPE STAPLE TACKER N ov 17, 1953 4 sheets-sheet 2 Filed Jan, 13. 1951 -N -TMI INVENTOR FRANK S. BORQUGHS Nm um a E -fd fm -M.T%\\\\ ATTORNEY Nov. 17, 1953 F. s. BoRouGi-ls HAND TYPE STAPLE TACKER 4 Sheets-Sheet 5 Filed Jan. 13, 1951 mi. SNN um om/ mm mm QN da, n m N n. v m B Q 51 i J 1 s mi XN -mfn No. om mm am M www u w mA E x kw w@ A m.

ATTORNEY4 Nov. 17, 1953 F. s. BoRoUGHs 2,559,083

' HAND TYPE STAPLE TACKER Filed Jan. 15 1951 4 Sheets-Sheet 4 ,may

Patented Nov. 17, 1953 HAND TYPE STAPLE TACKER Frank S. Boroughs, Elmhurst, N. Y., assignor to Arrow Fastener Co., Inc., Brooklyn, N. Y., a corporation of New York Application January 13, 1951, Serial No. 205,922

16 Claims. (Cl. 1-49) This invention relates to heavy duty gun type tackers or stapling machines.

An object of this invention is to provide a stapling machine of the tacker type that takes into vconsideration the span, the strength, and

vthe squeezing capacity of the average hand. It

will be observed that when a hand is opened up too much it does not have much squeeze force in opened up condition. Also, if the hand is closed up too much it does not have very much squeezing strength. As the hand is closed from open position there'is a zone where the squeezing power of the hand is greatest. The present stapling machine is so constructed that the handle of the stapling machine is squeezed during the zone of greatest force through the zone of greatest squeezing capacity.

In accordance with the present invention, although the staple used with the machine is an extra long one, the position of the handle when open in relation to the body linger grip hole, has been reduced by special operating lever design to a minimum. Furthermore, the machine is so designed that the hand squeeze power necessary to operate the machine has been reduced by special lever arrangement to be comfortable and to require less strength to squeeze. The machine is furthermore so Idesigned in accordance bpower to have a comfortable feel when the plunger to which the driver is attached is released. y The above mentioned features would be greatly appreciated by those Who use this tacker constantly on construction or other type of Work as it gives the user the feeling of power withcomfort.

Another object of this invention is to provide a highly improved means to achieve a relatively large staple driving power with comfort.

In accordance with the present invention the device comprises a body and a handle pivoted thereto, and a main support arm pivoted to the rear of the body and extending forwardlytherefrom, and a pawl pivoted to said main `support arm and adapted to engage a spring pressed driver, the handle being connected by links and ra lever to the pivoted main support arm, causing lifting of the arm about its pivot when the handle is squeezed down, stop means being provided on the body to engage one end of the pawl when the pawl reaches the firing point to cause the pawl to release the driver so that the compressed spring will move the plunger attached to the driver for driving the staple.

In accordance with the present invention the arc of the main support arm to which the pawl is attached is long enough to give it sufficient capacity for lifting the driver and the plunger attached thereto high enough to clear the crown of the next in line staple, and yet short enough so that the nal movement of the pawl in order to release the plunger is reduced to a minimum so that the mechanical release of the plunger and its driver is not unduly noticeable to the user.

In accordance with the invention, furthermore, the pawl itself is so constructed that the nal release of the plunger is accomplished in a smooth manner by reason of the provision of a perfect radius on the end of the pawl relative to its pivoting point. 'I'he pawl furthermore is so constructed that the mechanical release of the plunger is smoothly achieved. This is done by making the distance from the point of engagement of the pawl with the stop on the main body to the pivot point of the pawl much greater than the distance from the point where the pawl engages the plunger to said pivot point.

In accordance with the present invention the pawl is pivoted to the pivoted main support arm vat a point to which is also pivoted a link that connects the main support arm to a lifting lever, which in turn is pivoted at an intermediate point to the main frame and is vconnected by another link to the handle. This lifting lever and its connection by links to the handle and to the main support arm assures smooth operation of the lifting mechanism when under spring tension. The lifting lever is so positioned that the leverage of vsaid lever is increased as the handle is pressed down.

Another object of this invention is to provide in a tacker or stapling machine of the character ldescribed, a bracket xed to the handle and to -acter described, lifting and release mechanism so constructed and arranged that the plunger is lifted and fired with a minimum of friction. To accomplish this advantage the pivot point of the main support arm is so positioned as to control Furthermore, the position:

of the parts of the plunger which areengaged` by the pawl are practically on the center line of the spring load so as to prevent tendencyfofgthe plunger to tilt sideways and wherebythe plunger' will move straight up and down as the handle isf" squeezed.

Yet another feature of the present invention is the fact that the driver blade is anchored .to the plunger with a rivet and the upper end of said blade engagesan extrusion on the front wall oiVv the plunger. The plunger furthermoreis `so formed that its upper wings t into. the -front vcover-of the stapling device andtcenterssthe plunger and hence prevents tilting of the plunger forwardly. The upper: end-of the front.- wall of the-plunger furthermore rides on the inner. surfaceof the front cover .to assure straight Vup and downimotion for the plunger.

Yet another object of this invention'is-i to provide in astapling'device of the .character described, `a pawl having two sides interconnected by a bottomtransverse portion contacting an edge of the main supporting arm to limit rotation '10ft the--pawl relativeto said main supporting. arm.v

Yet another object of. this invention is to providefina stapling machine of the rcharacterdescribed; a front eoverprovided vwith sidewalls having.aligned'notchesin their upper ends and.

means on the body receivedin saidnotches so Y that` the cover is rmly'secured to the body by a screwpassing through registering openings inthe body. and cover, thereby allowing easyiremoval offthe Acover for cleaning vthe staple -,tra-clz.-V

Yet another object of -this invention i-s to pro?v vide in a stapling device of the character-described, two stopping points for the .handle,-one atthe front end ofthe handle whenthe handle raises, and anotherstopping point whenl the handleis squeezed, the latter comprising a rivet which attaches a link bracket to the underside of the handle and whichrivet contacts `the bod-y to limitsqueezing movement of thehandle.;

A stilliurther object-.ofthis inventionis. the e provision in a staple-.machineof the character described ofA a floating .magazine which allows thedriver Yblade toextend beyond the bodyso that staples can be driven fully The extension on the blade counteracts motion of the rebound.

thatis common. to the present ,type cita-ckers The ,magazine is hinged at its rear end -butzis free .to swing down somewhat below the underside of the body, and such movement. is limited by two lugs that extend forwardly from the front endof the magazine frame andt into slots in A the front wallof the cover. The slots are longer than the lugs allowing a spring `to push the magazineassembly down so that. the driver blade is either flush. or above the .surface of the magai zine, preventing the driver from scratching Athe finishedsurface on which the stapling machine is placed.` The lugs on the-magazine bod-y and theslots in the front cover also .help to .centralize the magazine track clearance with the driver vbe -remcved from the staple magazine.

4 blade and with the spacer that gui-des the driver blade.

Yet a further object of the present invention is to provide a highly improved pusher rod and means for locking the pusher rod in position to prevent it from jarring loose and yet to permit it to be readily removed when desired. To accomplishathis purpose ethereesirpivoted to the rivet that Y"secures theerear 'endiof "the staple magazine to the main body or frame, a latch that may be swung down to lock the pusher rod retaining-bracket in position on the machine, and whichmay be swung up to release the pusher rod-fandits retaining bracket so that they may The bracketrxedto-the rear end of the pusher rod had freedom ofv movement relative to the main body or frame, thereby permitting the swinging.: latch to clear the lug on the retaining bracket, the spring on the pusher rod serving to--push said bracketrearwardly -forkeeping the lug thereon in engagement-with-,theswinging latch.I

Yetanotherobject of this `invention istorprovide in afstapling machine of thecharacter .de scribed, a pair. ofxedostop members ,-on Athe main frame which. are engaged by. .the .endsof the pawl as the handle is-z squeezed to .disengage the pawl from the plunger at a I.predetermined point in--squeezi-ng thehandle, the. pawl .furthermore.being-provided,- with spring .means.. to returnthe-pawl to a position. for veng-aging...the plunger afterthe handle, is released.y

Yet a further object .of this; inventionis to providea stronpompact and durable-,stapling machine Yofthe,'character described, .which .shall be relatively inexpensive .to,.manufacture,.easy to operate, comfortable lin .use andryet.. practical and eflicientfto -a high. degreein ruse.,

Other 1 objects fof lthis. `invention. Hwill in.. part be obvioussand inapart hereinafter Apointed out.

The invention accordingly yconsists in, the v.features .of construction, Vecmbinationsof elements, and .arrangement of parts, which. will be exempliedinthe construction hereinafter described, and-.ofwhich-the scope .of invention will. be indicated in the following claims.

In the Y accompanying Vdrawings in: which `are shown ...various .illustrative embodiments Tof, this .inventiom Fig. 1 vis a vertical longitudinalcross-sectional view-through; a: stapling machinev embodying ...the invention, in normal. position;

Fig.- Lisa-.view similarto Fig.- 1 but showing kthe handle compressed and just beforerthe plunger is released fordriving a staple;-

Fig. 3 vis a side elevational'. View of.K thev stapler. with parts broken; away; .showing z some fof; the

parts ajust-aafter the :plunger Ahas Abeen released ISL-6 of Fig. 2;

Fig. 7 isa cross-sectional view'taken online 1 1 of Fgsi;

Fig.V 8 is a cross-sectional view taken on line Fig. 9'is a cross-.sectional view taken on line 9-9 of Fig.Y 2;

Fig.. 10 .is a cross-.sectional viewA takenon line lil-slloi-.Fg 1;.

,pling machine embodying the invention.

Fig. 11 is a cross-sectional view taken on line II--II of Fig. 2;

Fig. 12 is a partial vertical view taken along a plane of line I2-I2 of Fig. 3;

Fig. 13 is a cross-sectional view taken on line I3-I3 of Fig. 1;

Fig. 14 is a cross-sectional View taken on line I4--I4 of Fig. 1;

Fig. 15 is a side elevational view of the main frame member;

Fig. 16 is a side elevational View of the front cover;

Fig. 17 is a side elevational View of the pawl arm;

Fig. 18 is aside elevational view of the pawl; and

Fig. 19 is a top plan View of the bottom stop member.

Referring now in detail to the drawing, I9 designates a heavy duty gun type tacker l.or sta- The same comprises a main body frame II (Fig. 2). Said frame II comp-rises a pair of similar symmetrically disposed complementary mating frame members I2 (Figs. 2, 6, 1l and 15). Since said members are similar, Ionly one thereof will be described. Each of said members I2 may be made as a die stamping of sheet metal. Each member I2 comprises a fiat wall portion I4 (Figs.

5, 6 and 15) having a straight longitudinal bot .s

tom edge I5. Above said bottom edge said wall I4 is formed with elongated longitudinal horizontal hand hole I6. The hand hole I6 (Figs. 2 and 3) has upper and lower longitudinal flange portions I'I interconnected by end semi-circular o flange portions I8. Said flange portions I'I and I8 are connected to the wall I4 by curved corners I'Ic and ISC, and are curved inwardly and terminate in longitudinal edge portions IIa and semi-circular edge portions I8a. When the two frame members are assembled the edge portions I'Ia and Ia of the two frame members mutually contact, as will appear hereinafter.

The wall I4 is furthermore formed below the hand hole I5, with a longitudinal inwardly pressed transversely curved rib I9 (Figs. 3, l1 and l5) terminating short of the rear end of wall I4, as at I9a., and terminating at the forward end of said wall, as at I9b. At the front end of the flat wall I4 is an outwardly extending vvertical shoulder 20 (Fig. 15) having above its lower end a semi-annular portion 20a. The shoulder 29 extends to the lower edge I5 of the wall I4. The shoulder extends also to an upper `forwardly and upwardly inclined edge ZI (Fig. 15) of said wall. Extending forwardly from the shoudler 28 is a flat vertical wall 22 (Fig. 5), having a lower edge 23 (Fig. 4) in the plane of the edge I5.

Wall 22 is parallel to wall I4 and spaced outwardly therefrom. Extending upwardly from the rear end of the lower edge I5, is a vertical edge 25 (Fig. 3), formed above its lower end with an inwardly extending rectangular notch 26 (see also Fig. l5). Edge 25 terminates at point 2'! substantially at the level of the edge I 'Ia of hand hole I6. Extending upwardly from edge 2'Iy is an inwardly curved flange portion 2B formed with an inner edge 23a in the plane of edge I'Ia, Ida, said edges being in the plane of the split between .the two mating or complementary frame members I2.

Extending upwardly from curved portion 2i) is an outwardly and then inwardly curved ila-nge portion 29 having an inner edge 29a (Fig. 13)

forming a continuation of the edge 28a. The flanges 28, 29 are connected to the wall I4 by curved corners 30 (Fig. 5). Extending forwardly from the upper and inner end of the flange portion 29 is a flange portion 3I which increases in curvature toward its front end, being substantially semi-annular at its forward end. The flange portion 3l has an inner edge 3Ia (Fig. 1) forming a continuation of the edge 29a. At the forward end of the flange portion 3| is a more flattened flange portion 32 curved upwardly and having an inner edge 32a forming a continuation of the edge 3 Ia. The flange portion 32 terminates in an upper edge 33. It will be noted that the flange portions 28, 29, 3I and 32 all extend from the flat wall I4.

Said flat wall I4 is formed with a forwardly extending horizontal edge 34 (Figs. 1 and 15) extending forwardly from the upper edge 33. Extending from the forward end of edge 34 is the forwardly and upwardly inclined edge'2I referred to hereinabove. The edge 2| extends to the shoulder 20. At the upper end of wall 22 is a forwardly and upwardly inclined edge35 forming a continuation of the edge 2I after the break due to the shoulder 20. The inclined edge 35 merges with a forwardly and downwardly curved edge 36 (Fig. 3) from which extends a downwardly and forwardly inclined edge 31, terminating at a point 38 which is the upper end of the front edge 39 (Fig. 3) of wall 22.

Said wall 22 (Fig. 15) is formed at its front edge 39 and above its lower edge with a `square notch 40. It is also formed with an elongated vertical groove or notch 4I (Fig. 1) disposed between the notch 40 and the upper end 38 of said front wall. Said wall 22 is furthermore formed with a square through opening 42 (Fig. 3) aligned with the notch 49 but spaced rearwardly thereof. Said wall 22 is furthermore formed at the center of curvature of the curved edge 36 with a through opening 43 (Figs. 1 and 4) for the purpose hereinafter appearing. Said wall 22 is furthermore formed with a horizontal slot 44 (Fig. 4) disposed below the through opening 43. It is also formed with an outwardly pressed downwardly projecting square prong 45 (Fig. 4) disposed below the slot 44 and in alignment with the forward end of said slot. The prong is disposed just below the level of the upper end 38 of the front edge 39 of wall 22.

The curved shoulder portion 20a forms a semicircular extension 48 of wall 22. At the axis'of said semi-circular extension is a through opening 41 (Figs. 2, 5 and 15) for the purpose hereinafter appearing.

Wall I4 (Fig. l5) is furthermore formed adjacent its rear end, substantially at the level of the lower edge Ila and between said edge and the upper end of the rear edge 25. with a through opening 50 (Fig. 2). Said wall I4 is also formed between the rear end of the hand hole I6 and the flange 2S with an inwardly pressed annular portion 5I (Figs. 3 and 13) at the center of which is a through opening 52 (Figs 13 and 15). The center of the opening 52 is disposed vertically above the center of the opening 53. Said wall I4 is furthermore formed adjacent the shoulder 29 and substantially at the level of the lower portion of the flange 3l with a through opening 53 (Fig. 3). Said wall I4 is also formed adjacent to and rearwardly of the opening 53, with an inwardly pressed longitudinally curved shoulder 54 (Fig. 1) having a lower curved stop edge 55 located in a horizontal plane.

It Wiil'nowfbennderstoodathat theftwoframe I .la;| 8a; 2811,12 911,13 I a'and .32a .of one. contacting saidwedges of the'fother-.z Means is. provided vto holdsaid frame membersv together with 'said edges mutually contactingsf. To this end asrivet-SE (Fig. 13)` isf.,1passed1.through .the openings 52.v The headsfI'KFigsB .andfl3) of the rivet`r 55 are rreceived within'"the.frecessed portions- 51.-. Said frame members are furthermorexed.together by means of;y azrivet. 581` (Figs;'2, 3 and 8) passing through the openings 58.. The heads of the rivet itcontactthe .walls I4 lof v the frame members .-I 2.

Fittedover the .front of the main body Lframe I I-,l which comprises the frame members |2,1:is Aa front cover 60 (Figs. 25 and 16). `Saidifront cover 60 comprises avertical transverse front wall 6K (Figs. 5 :and 6) from which extend parallel side' walls: 62 (Figs: 3 and 5) 'Ihe front Wallcontacts thefront edges 38 of the frame members I2 andethe sidewalls. 62"contact the outer surfaces ofowalls 22 :fof Ssaidframe members. The front wallSI has afbottom-edge 63 (Fig. 2) in the plane of thebottom-edg'es i5 and 23.1 It has a top'edge 6I substantially at the level of pointsV 38Iof the frame members I2. The vfront wall`6| is' formed witha f longitudinal forwardly recessed, `substantia-ily rectangular lportion 65 l(Fig. 2) for the purpose-hereinafter appearing. Said front vwall is i'urthernlore formed nearv its lower end with a pair of parallel spaced slots G (Fig. l2). for the purpose hereinafter-appearing.

The side walls 62'h`ave lower edges 67 (Figs. 3 and liinthe plane ofthe edges S3, 23 and |5.

Extending upwardly fromvthe rear vend* of the lower edges rll 'areedges B8 coextensive `with-the lower-portions oi' the shoulders "20. Extending from the edges 68 are .semi-circular edges 50 vfollowing f' the curvature ofthelshoulder 20a and forming 1an ear10.' Extending from-the upper portionk of Aedge 69 'of eachside-wa'll is aforwardly and downwardly curved.' edg'e II from. which'A extends forwardly` a horizontaledge 12. Extending from edge 'I2 is an upwardly Aextending vertical edge y'I3' parallel to the front wall 5|.' At the upper end of the side' walls 62 are horizontal edges I4 (Fig. 3) at the level ofthe upper edge 04 of the front `wall 6|. The upper edges 'I4 are formed with downwardly extending knotches 75 into which the outwardlyextending prongs 5 (Figs. 4 and 16) projectl to properly locate the fr'ontbover with respect to the main-frame- II. Tl'e ears I0 ofthe side -walls |i2fareA formed with'through openings I8 (Fig. 5)'whichregister withithe through openings 4'I 'and the side walls 22. Extending through the registeringopenings 4T, 'I8 is a screw 80 having a head 8| at one end contacting one ear l0." Screwed vto theopposite end'of the screw B0 is a nut 82 contacting the other ear 10.'

Interposed between the side walls 22 ofthe frame member II is a horizontal lower spacer member 83 (Figs. 1 and 2) having at its forward end outwardly extending lugs 84 (Fig. 3) Yprojecting into the lower portions of the notches 40 (Fig. Said spacer is also provided with outwardly extending wings 85 (Figs. 3 and 5) projecting into the lower portions of the square holes 42; It will be noted that thickness of the spacer 83 is equivalent to one-half of the height of the notches and rectangular openings 42. The spacer 83'fis formed at its forward 'end with a shallow groove 86 (Fig. 2) spaced fromthe inner surface of the front wall EI of the front cover 60.

The outer edges of the wings '84- contactY the inner.` surface lof "the 'side 'walls 62 of thefffront cover. Overlying the front portiono spacer 83 is a :bumper disc or plate (Figs. 2 ando) having front wings 89 superimposed over thefwings` 84. The .bumper plate 88 also has wings .S8 superimposed over the wings 85. The wings i 8S pass throughzthe notches elif whereas thewings 90 pass through the openings 42. It will be 'noted that the combined V,thieimesses' of the spacer 83 and the plate 88 are equivalent to the height-fof notches 40 and openings 42; Bumper `plate 88 is formed with a notch 28a in its iorwardzedge registering with the. notch Vor groove '88.'

It will be noted furthermore that the spacer 83 has ya rear portion83d (Fig. 5) which extends rearwardly of the bumper 88. The spacer-'83 serves to accurately space the frame members I2 and to prevent the side walls ol' the .members fromv being pressed too close A together. Said spacer 83 also serves as a bottom stopxfor a plunger 9| (Fig.'3) to be described hereinafter. The bumper 88 maybe made of neoprene, rubber :or the like material to serve as a shockiabsorber for a spring actuated descending plunger 8| as will be described hereinafter.

For the purpose hereinafter appearing there is riveted to the rear portion 33a of the .spacer 83 a leaf spring 92 (Fig. `5) having a rear downwardly projecting curved free tongue 93v (Fig. 2). The spring 92 is attached'to the spacer 83 by means of the rivet 94.

The side walls 22 vof the frame members are furthermore separated by a top spacer and stop member 95 :(Figs. l, 2 vand f!)y having outwardly extending wings 05 (Fig.-7) projecting through the openings or slots 44 in the side y'.valls 22. The side edges of the spacer contact the inner-surfaces of the side walls 22 to space the latter. Said spacer 95 is formed with'a-central-through opening 9`I and with a plurality of downwardly extending annularly arranged prongs 9B surrounding said opening. The center of the lopening'Q'I is substantially centrally located with'respect to the bottom-bumper 88.

Extending through the aligned openings `50- of the frame members I2 is a transverseV pivot pin |00 :(Fig. 2) having heads y||)| at its outer ends. Disposed between the frameinembers I2 adjacent the bottom of the frame and pivoted to the pivot pin |00 is a staple magazine |02 (Fig. 2). Said staple magazine |02 comprises a magazine body |03 (Fig. 4) having a bottom wall |04-from which extend upwardly parallel side walls. |05 formedpat their upper ends with inwardlyextending flanges |06. The side walls |05 are disposed between and substantially contact grooved portions I9 (Fig. 11) They are formed adjacent their rear ends with upwardly and rearwardly inclined apertured ears |01 through whichV the pivot pin |00 passes.

The bottom-wall |04 has at its front enda forwardly projecting tongue |08 (Figs. 1 and 6) spaced rearwardly from the front ends of the side walls |05. The side walls |05 are formed at their forward ends with forwardly projecting'lugs '|09 (Fig. l2) passing through the slotsl 66 in the front wall of the cover 60. The lugs |09 are somewhat shorter than the slots 66 so that there is a lost motion or movement permitted betweenthe lugs |09 and the slots E8 in an up and down'direction. When the upper ends of the lugs |00 conta'ctthe upper ends of the slots 66 the bottom surface of the bottom wall |04 of the magazine body is flush with the -lower edges of the frame members and 'front cover.

The spring tongue 93 (Fig. 1) contacts the anges |06 and serves to normally depress the forward end of the staple magazine to cause a slight movement of the staple magazine about its pivot so that normally the front end of the staple magazine projects about le" below the front end of the frame and cover.

The upwardly and rearwardly apertured ears |01 have upwardly and rearwardly inclined rear edges ||0 (Fig. 1), and the rear ends of the side walls haveupwardly and forwardly inclined edges III forming a V with the edges |I0. Ears |01 and side walls |05 are part of the same unit. The inclined edges I0 and the inclined edges I are both at the rear ends of the side walls |05.

Disposed within the staple magazine and extending longitudinally thereof is a staple guide member I |2 (Figs. 2 and ll) comprising a bottom wall |I3 (Fig. 4) from which extend upwardly parallel side walls I4I spaced inwardly from the side walls .|05 and having upper edges spaced below the flanges |06. The forward end ||3a of bottom wall I3 is disposed rearwardly of the forward edges of side walls ||4 and rearwardly of the forward edge of tongue |08. The bottom wall I3 is riveted to the bottom wall |04 by rivets I |5. Between the staple guide I I2 and the staple magazine |03 is formed a passage for a staple strip I|6 (Fig. 2). The side walls ||4 of the staple guide are formed at their forward end with downwardly extending flanges or tongues ||1 (Fig. l) engaging opposite sides of the forwardly extending tongue |08. The forward ends I|8 of Pivoted on to the ends ofthe pivot pin 00 is v,The keeper member |40 comprises side portions the side walls ||4 of the staple guide are spaced y from the front wall 63 to form a passage |20 (Fig. 2) therewith fondriving a staple therethrough. The passage |20 is aligned with the notch 86 in stop 83 and the notch 88a in the bumper disc 08. i

Means is provided to resiliently urge the staple strip ||6 forwardly so that the foremost staple will enter the passage |20. To this end there is provided a pusher mechanism |23 (Fig.` 2). The same comprises a rod |24 passing through the staple guide ||2 longitudinally thereof.- At the forward end of the pusher rod |24 are upset lugs |25. Slidably mounted on the pusher rod |24 is a pusher member |26 made of sheetl metal Vand comprising a top wall |21, the side edges of which rest on the top edges of said walls |I4 of the staple guide. Extending downwardlyfrom the front and rear ends of the top wall |21 are fianges |29 formed with throughopenings through which the rod |24- passes. A spacer sleeve |30 may. surround the rod |24 between the apertured flanges |29. The top wall |21 serves to push the staple strip ||6 forwardly. Surrounding the rod |24 rearwardly of the pusher member` |26 isa coil compression spring |3|. Riveted to the rear end of the rod, asat |33, is alatch member |34 comprsing a rear wall |35 (Fig. (i) having a rearwardlyV extending upper lip |36 disposed just below the lowerendsofthe flanges 28. Spring |3I contacts rear wall |35. f

Extending forwardly from theback wall |35! are side walls |31 (Figs. 1 and 6) having V-shaped forward edges adapted to' it into the V.Y groove formed by edges ||0, of the side walls of the magazine body, but 'normally spaced therefrom. It will thus be notedrthat the sidewalls |31 of member |34` fit within the sidewalls |4 of the frame members. Extending outwardly fromzthe back wall |35 are lugs |38 .,(Fig. 6.)H which' are adapted to move into the rearr notches -26 (Fig.; 3) 0fA the Side walls M 0I the frame .members g,

|4| having suitable openings through which the pivot pin |00 passes. Said side portions |4| also have downwardly extending portions |42 formed with openings |43, to provide a better grip for the fingers of the operator. The side portions ,.I4I are interconnected by a rear strap |44 which extends around the back wall |35 below the lip |35. The strap |44 thus engages member |34 to prevent the pusher mechanism from coming out. In such position the forward V-shaped edges of the side walls |31 are spaced from the V-shaped grooves formed by edges ||0, To remove the pusher rod member |34 is first pushed forwardly and then the keeper member |40 is swung ,in a counterclockwise direction, looking at Fig. 6, so that the strap |44 moves above the lip |36. The whole pusher mechanism may then be removed rearwardly from the staple magazine to permit loading of another staple strip. After a new staple strip is loaded the pusher mechanism is reinserted,v member |23 is pushed forwardly .and the latch |40 is then swung down so that the strap |44comes below the lip |36. Member |23 is then released and the strap keeps it from come ing out.

The plunger 9| comprises a housing |45 (Fig. 3) provided with a bottom wall |46. Extending upwardly from the front of the bottom wall |46 is an upwardly extending front wall |41 having at its upper end a forwardly projecting vertical upward extension |48.` Saidextension |48 has wing extensions |48a (Fig. 4) received in groove 4| to aid in guiding the plunger Iup and down..

In Fig. 4, part of the wall 22 is broken away so that part of one wing 48a can be seen. Said front wall |41 is formed with a forwardly and downwardly projecting prong |48 (Fig. 1) pushed out from said wall and having a lower edge |50. TheV extension |48 is adapted to contact the inner surface of the front wall 6| of the front cover 60 above the forwardly recessed portion 65 of the latter. Extending upwardly from said bottom wall |46 is a Vrear wall |5| formed with a through opening`|52 (Fig. 2). Extending rearwardly from the front wall |41 are side walls |53 (Fig. 3) each formed with a rearwardly exf tending hook |54 having an upwardly and rear-l wardly inclined hook underedge |55. The hook edge |55 is located substantially midways between the front wall |41 and the rear wall |5l.

It will be noted thatv the sidey walls |'53'are disposed in planes disposed beyond the side Vedges of the rear wall'|5|. Extending inwardly from the lower. ends of the side walls are bottom anges |55 (Figi ,4) contacting the underside of the 'bottom wall |46'. The flanges |56 have inner substantially meetin'g edges.` In normal condition the plunger restson the'bumper plate Y8,8, the undersurfacesr of the iiange |56 contacting said bumper. "'Interposed between thebottomA wall |46` andthe top stop member fand' received within ythe plunger is a coil compression spring |60 (Fig'lsf'l and 4) which pressesrthe Vplunger downwardly against the bumper lplate 88 on thefbottom 'stop 83. The upperfend ofthe coil compression spring |60 surrounds the downwardly projecting prongs 98 (Figs. 1 and ,4.) the spring.

,Y Riveted to theV front surface yor throritwall |41 by rivet IGI-aligned; with opening |52 andY ridinsin recess 65,515 a, dui/giggled@ 26,2.,(Fia11 Y' which*r serve to center 1l which passes down through the notches 88a and 85'and through the passage |20 for driving the foremost staple of the staple strip I8 when the stapling machine is actuated. The upper edge of the driver blade |62 contacts the edge of the prong |49 on the front wall |41 of the plunger. In normal condition the lower end of the driver blade projects about 11g" below the lower edge of the iront wall of the front cover, being ush with the underside of the front end of the staple magazine, which also projects about 11s" below the front cover. The staple magazine prevents the lower end of the plunger blade from scraping the surface on which the stapling device may be placed.

Means is provided to raise the plunger against the pressure of the spring and to then release the plunger so that it is forceably moved downwardly by the compressed spring |60- to drive the staple. To this end there extends through the openings 43 in the side walls 22' of the frame members |2, a transverse horizontal rivet (Figs. 2 and 4) having rivet heads |60 at its outer ends, spaced from said side walls 22. Mounted for oscillation on the rivet or pivot pin |65 is a handle member |61 (Fig. 1). Said handle member |61 may be made of die stamped sheet metal. It comprises an upwardly and rearwardly inclined wall |69, the for-ward lower edge |68a (Fig. 2) of -which normally contacts the upper end edge 64 of the front wall 6| of the cover. Extending rearwardly and inclined upwardly but to a lesser degree than wall |98', is

wall |69 (Fig. l) from which there extends a rearwardly curved top wall |10, slightly bent or curved downwardly at its rear end, as at |1| (Fig. 3). Extending downwardly from walls |63 and |69 and from the forward end of top wall |10 are parallel side walls |12 receiving the side walls 22 therebetween. Walls |12 are formed with aligned through openings |14- (Fig. e) registering with the openings 49. The rivet |65 passes through the openings |114 and the rivet heads |66 contact the outer surface of said side walls |12. At the rear ends of the side walls- |12 are inwardly extending shoulders |15 (Fig. 3) which are aligned with the shoulders 20, when the'handle is in normal up position. The side walls |12y have at their forward ends bottom edges |19 adapted to Contact the upper edges 14 of the side walls 62 of the front cover, when the handle is in normal up position.

ltearwardly of the edges |16 are underedges |11 (Fig. 3) at a somewhat higher level. Ex-

tending downwardly from the top wall |10, |11 i are side walls |18 disposed rearwardly ofr the shoulders |15. The sidewalls |18 have at their forward ends underedges |19 at the level of the edges |11. Extending from the rear ends of the edges |19 are upwardly and rearwardly part-circular edges from which extend rear-` wardly and upwardly curved edges |8| vwhich merge withuthe rear ends of the topwall 11|.

SurroundingVv the pivot pin |65 is a coil torsion. 65.

spring |82 (Figs. 2 and 4), one arm of whichvr contacts the rear edge of the( top. stop 95, and the other arm of. which contacts the underside ofv top wall portion |69. The coil torsion spring |82 normally tends to rotate: the. handle in a counterclockwiser direction. In other words, the torsion spring tends to raise the handle when the handle issqueezed down and then released. The engagementofxthe lower edge v#68a of the handle with the upper; edge 60 of the front cover i serves to llimit upward movement of the rear end of the handle.

In operating the stapling machine the palm o! the hand contacts the top of the handle in the region of top wall |10 and the fingers pass through hand hole I9. The hand may then be moved to move the handle toward the body to operate the stapling machine.

Attached to the underside of the top wall- |10 of the lever I6 and adjacent the wail |99 isa handle bracket (Figs. 2 and 9'). Said bracket |90- has a top transverse wall portion |9| contacting the underside of said top wall |10-Yand it is iixed thereto by a pair of longitudinaliy spaced rivets |92. Extending downwardly' from the forward end of the top wall |-9| are side walls |93 formed with aligned through openings |94. The lower ends |95 (Fig. 9) of said Vsidewalls |93 are pressed inwardly toward each other, buty are spaced apart. The space between the4 lower ends or ngers |95 is less than the space between the wall portions |93.

Mounted on and between the side wallsl |99 and received within the aligned openings |94 is -a transverse pivot pin |96. PivotedA on said pivot pin |96 and extending between thegu-ide fingers |95 is the upper end of an upper tink |91 (Figs. l, 2v and 9). The link |91 extends downwardly below said fingers |95. The lower end of the link |91 is formed at its lower end with a through opening |98 and extending therethrough is a pivot pin |99. Pivoted to the pin |99 is a lever 200 (Figs. l and 10).

The lever 200 comprises a pair of spaced similar side walls 20| (Figs. l, 9 and 10) interconnected by top web portion 202. Said side walls 20| have rearwardly extending'` arms 2.03 receiving the lower end ofthe upper link there-- between, and said arms are formed with registering openings through whieh opposite ends oi the pivot pin |99 pass. Said side walls 20| are. furthermore formed with: intermediate through openings 204 (Fig. 1) through which the rivet 50.. passes. The rivet 58 serves as a fulcrum for rotation of the lever 200. At the forward ends of the` side walls. 20| are aligned through openings 205A (Fig. l) through which pass a transverse pivot pin 206r traversing the space between said side walls. It will be noted that the for-- wardly extending arm. of the lever 200 is. longer than the rearwardly extending arm thereoi'.

Received between` said side walls 20| is the upper end of a lower link 2.011 (Figs. 2 and 10)' formed with through opening through which the pivot pin 206 passes. Said lower link 291 comprises. side walls 200 interconnected by a rear web 209. It isl theupper ends-.ofr these side wallsl 200 which are formed withI the; opening through which the; pivot .pin 206 passes. The. upper portions of the side walls 200 are spaced closer to'-v gether than the lower. ends 2|01ot saidzside wallsr The side. walls 208 contact. the inner surfaces of the side walls 20|'. of lever 20.0. At the. upper ends of the lower portionsv 20|.. areshoulders 2li. The lower ends 2H) of the lower link are formed with through openings through which passes a transverse pivot pin 2|2.

It will now be noted that the; forward edges of the side walls 208 are cut back as at 2R (Figs. 2 and 17) so that duringthe operation of the device. saidk edges will not contact the plunger.

Pivoted to the rivet or pivot-pin 56 is a pawl4 sup4 porting arm 2 5 (FigfZ') which passes through the framebody between vthe hand hole i9 and the top wa113|. Saidmember 2 |51 comprises' a pair of'snm 13 ilar'symmetrically disposed pawl arm members 216 (Figs. 2 and 12) attached together by a pair of spacer rivets 211 (Fig. 13). Each of the members 216 comprise an intermediate elongated portion 218 formed with a pair of spaced slots through which the reduced ends of the spacer rivets 211 pass. Said portions 218 are in parallel vertical planes. At their rear ends are outwardly recessed rearwardly inclined apertured ears 219 formed with openings 219s through which the pivot pin 55 passes. At the forward ends of the arms 218 are outwardly pressed shoulders 220 (Figs. 2, 10 and 17) and extending therefrom are parallel head portions 22 1 formed with aligned curved slots 222 through which the pivot pin 53 passes. The center of the slots 222 is pin 56 to permit oscillation of the pawl arm 215 between limits. The walls 221 of the pawl arm 215 (Fig. 10) contact the outer surfaces of the lower'ends 210 of the lower link and the side walls 20| of the lever 205. Said walls 22| are formed adjacent their lower forward ends with through openings 223 receiving the outer ends of the pivot pins 212. y

It will now be understood that when the handle 161 is moved toward the body, the link 191 will be pressed downwardly to cause clockwise rotation of the lever 200, thereby raising the lower link 201 and at the same time raising the pawl arm 215, moving the latter in a clockwise direction. The slots 222 permit said upward movement ofthe pawl arm 215. y

Pivoted to the pivot pin 212 is a pawl 235 (Figs. 2 and 18). Said pawl 230 comprises a bottom web 231 from which extend upwardly side walls 232.V The side walls 232 are in the shape of bell cranks and comprise intermediate ears 233 (Fig. 10) formed with through openings 234 to receive the outer ends of the pivot pin 212 (Figs. 3, 10 and 18). The intermediate ears portions 233 of the pawl contact the outer surface of the side walls 221 of the pawl arm. The web 231 contacts upwardly and rearwardly inclined lower edges 235 of the side walls 221 of the pawl arm Surrounding the pivot pin 212 andvdisposed between the lower ends 210 of the lower link 201 is acoil torsion spring 236 (Figs. l and 10) having one arm 231 contacting the front surface of the web 209 of the lower link and another arm 238 contacting the underside of the web 231 ofr the pawl. The coil torsion spring 236 thus serves to press the web'231 against the underedges 235` of the pawl arm members 216. Extending upwardly and rearwardly from the intermediate ear portions 253 of the pawl are arms 235, (Fig.

3) having heads 240 at their rear ends lying substantially against rthe inner surfaces of the side walls T14 of theframe members 12. The heads 2211 are located below the prongs V511. Extending upwardly and forwardly from Vthe intermediate portions of the pawl are outwardly pressed fingers 242 (Figs. 3 and 18) straddling the rear wall 151 of the plunger and disposed inthe planes of the side walls 153 of said plunger. The fingers 242 are formed with upper end edges 243 which havea curvature relative vto the axis ofthe pivot pin 212 and are adapted to engage beneaththe underedges 155 of the hooks 154 on theplunger y The operation of the stapung `machineWin now be described.` Beginning with the parts in the position shown in Fig. 1 it will be noted that.

the plunger Vis pressed downwardly byfVJtheKcoil compression spring 160, 4' the handle is up, the

14 plunger `blade projects about below the front cover, and the spring 92 presses the staple magazine downwardly so that its forward end also projects about 11e" below the front cover. The staple magazine is .then placed on agsheet S to be stapled to a plate P. The stapling machine isgrasped as stated aboveby placing the palm of the hand against the top ofthe handle and passing the,v fingers through the hand hole 16 with the thumb straddling the handle. dle is then squeezed by squeezing the hand, causing thel upper link 191 to press downwardly and rotate the lever 250 about the pivot pin 58, thereby raising the lower link 201 and thru the pinv 212v raising the vpawl. supporting arm 215. As

the pawl arm is raised the pawl 230 engagesv the hook edges of the plunger 145. and elevates t'he plunger and the driver blade.` As they handle is further pressed downwardly toward the main frame, the plunger will be raised to the position` shown in Fig. 2, thereby compressing the coil spring 160.

causing webs 231 to move away from edges 235 e thepouter ends 2113l of the Vlingers 242 of said pawl to vmove off. .theedges 155, releasing the plunger and permitting the latter to descend sharply under they influence of the compressed coil spring 1.50, and thereby causing the driver blade to drive thegforemost staple of the staple strip through the passage, through the sheetV S.

vided a stapling machine of the tacker type that takes into consideration thespan, the strength,- and the squeezing capacity of the average hand. When the hand is opened up too much itdoes not have .very much squeezing force.. Also, 1 if the. handis closed uptoo much it does not have very` muchsqueezing strength. ,As the hand is closed y from openposition, there is a zoneV wherethe.

squeezingpower of the hand is greatest. With the present stapling machine the .arrangement is such that the handle is squeezed during. the zone of the greatest squeezing strength ofthe hand. With thepresent device the amount vof handlet 'rotation is-,m'inimized so that it need be rotated; only4 during thev .zone1,o f greatest fsqueezing... f strength; A Furthermore, the arrangement' of thel -pawl arm 215, thepawl 230', .thelinksland-.the- I lever, andthe handleis suchnthat-less strength-, is-required to squeeze the handle lfor. drivingv a e staple. Furthermore, in theiiring position, thatV is in the position where the pawl moves yoif the. plunger, the handle is suiciently openedup sor l thatthehandsdu has considerable strengthto effect the firing or release of the plunger;`

It will be observed that the mainsupportor i pawl arm 215 is of considerable length, being pivoted adjacent the rear endfof the'main frame, thereby reducing'the strength'vnecessary tcop-i` erate the stapling: device. The movement ofthe mainfpawl arm is short enough however'soy that the rnsmovementpf the `pawliinorder tore ,lease the plunger is reduced rso that the" The hanv At the end ofthe stroke the.. heads or enlargements 240 on therear ends of. thel arms 239` on pawl 230 contact the lowerY terconnecting the other arm ofsaid link with the forward end of said pawl arm, a pawl pivoted to said pawl arm and being provided with means to releasably engage the plunger, said pawl having a rearwardly extending arm, and stop means on the body adapted to engage said arm upon moving the handle towards the body for rotating the pawl to release the pawl from said plunger.

5. A stapling machine comprising a main frame body provided with a hand hole, a handle pivoted adjacent its front end to said body adjacent the front upper end of said body, a bottom stop in said frame body, a top stop in said frame body,a plunger slidable in said frame body, a coil compression spring interposed between said plunger and top stop for pressing the plunger toward the bottom stop, a driver blade on said plunger, a pawl arm pivoted adjacent its rear end to the rear end of the frame body, a lever pivoted mediately the ends thereof to said body, means including a link interconnecting one arm of said lever with the handle, a second link interconnecting the other arm of said link with the forward end of said pawl arm, a pawl pivoted to said pawl arm and being provided with means to releasably engage the plunger, said pawl having a rearwardly extending arm, stop means on the body adapted to engage said arm upon moving the handle towards the body for rotating the pawl to release the pawl from said plunger, and spring means to urge the rearwardly extending arm of said pawl toward said pawl arm.

6. A stapling machine comprising a main frame body provided with a hand hole, a handle pivoted adjacent its front end to said body adjacent the front upper end of said body, a bottom stop in said frame body, a top stop in said 'frame body, a plunger slidable in said frame body, a coil compression spring interposed between said plunger and top stop for pressing the plunger toward the bottom stop, a driver blade on said plunger, a pawl arm pivoted adjacent its rear end to the rear end of the frame body, a lever pivoted mediately the ends thereof to said body, means including a link interconnecting one arm of said lever with the handle, a second link interconnecting the other arm of said link with the forward end of said pawl arm, a pawl pivoted to said `pawl arm and being provided with means to releasably engage the plunger, said pawl having a rearwardly extending arm, stop means on the body adapted to engage said arm upon moving the handle towards the body for rotating the pawl to release the pawl from said plunger, and spring means to urge the rearwardly extending arm of said pawl toward said pawl arm, the means for pivoting the lever to the body comprising a transverse pivot pin mounted on said body, and said pawl arm being formed With an arcuate slot through which said pivot pin passes.

7. A stapling machine comprising a main frame body, said frame body comprising a pair of similar symmetrically disposed frame'members having registering handV holes and having one arm of said lever with said handle, a second link interconnecting the other arm of said lever with said pawl arm, a pawl pivoted to said pawl arm about the pivotal point between the second link and said pawl arm, said pawl having means to limit rotation of the pawl relative to said pawl arm in one direction, spring means to urge pivotal movement of said pawl relative to said pawl arm in said direction, a plunger sldably mounted within said body, said plunger having side walls formed with hooks, and said pawl having means to engage said hooks, and a driver blade Xed to said plunger.

8. A stapling machine comprising a main frame body, said frame body comprising a pair of similar symmetrically disposed frame members having registering hand holes and having meeting edges, a rivet interconnecting said frame members, a pawl arm pivoted to said rivet, a second rivet interconnecting said frame members, said pawl arm having a slot through which said second rivet passes, a third rivet interconnecting said frame members, a handle pivoted to the third rivet, a lever pivoted to said second pivot, means including a link interconnecting one arm of said lever with said handle, a second link interconnecting the other arm of said lever with said pawl arm, a pawl pivoted to said pawl arm about the pivotal point between the second link and said pawl arm, said pawl having means to limit rotation of the pawl relative to said pawl arm in one direction, spring means to urge pivotal movement of said pawl relative to said pawl arm in said direction, a plunger slidably mounted within said body, said plunger having side walls formed with hooks, and said pawl having means to engage said hooks, and a driver 'blade xed to said plunger, said hooks being located midway between the front and the back of said plunger.

9. A stapling machine comprising a main frame body, said frame body comprising a pair of similar symmetrically disposed frame members having registeringhand holes and having meeting edges, a rivet interconnecting said frame members, a pawl arm pivoted to said rivet, a second rivet interconnecting said frame members, said pawl arm having a slot through which said second rivet passes, a third rivet interconnecting said frame members, .a handle pivoted to the third rivet, a lever pivoted to said second pivot, means including a link interconnecting one arm of said lever with said handle, a second link interconnecting the other arm of said lever with said pawl arm, a pawl pivoted to lsaid pawl arm about the pivotal point between the second link and said pawl arm, said pawl having .means to limit rotation of the pawl relative to said pawl arm in one direction, spring means to urge pivotal movement of said pawl relative to said pawl arm in said direction, a plunger slidably mounted within said body, said plunger having side walls formed with hooks, and said pawl having means to engage said hooks, and a driver blade Yiixed to said plunger, said hooks being located midway between the front and the back of said plunger, a bottom stop iixed to said body and below the plunger, a top stop xed to said body and disposed above the plunger, and a coil compression spring interposed between the plunger and the top stop for pressing the plunger down against the bottom stop.

y 10. A stapling machine comprising a main frame body, having a hand hole, a rivet on said body, a pawl arm pivoted tosaid rivet, a second rivet on said body, said pawl arm having a slot @onerose through which said second Yrivet passes, `a third rfrivet on saidbody,a lhandle pivoted vtothe third `rivet, -alever pivoted-to saidsecond pivot, -means lincluding va link interconnecting'one arm of `said lever-.with rsaid handle, asecond link interconnecting the otherfarmof said lever with'saidpawl "arm, a pawl pivoted to said -pawlarm -aboutthe pivotal point'between the Vseoond'linlr and said -lpawl arm, `said pawl having Ameans lto limitv rota- :tion of the paw1=relative to said lpawlarm-in-one direction, spring `means lto urge pivotal movement of said pawl relativeto saidpawlarm vin said direction, and a plunger slidably mounted within said'body'betweensaid 'frame members,

said plunger having sidefwallsiormed-with hooks,

-a pawl Vpivoted to said -pawl arnLa plunger slidably mounted within said'body and having side walls formed with underedgesengageable byfsaid 'pawl, said underedges having a curvature, the

fcenter of which -is the-pivotal pointof said pawl relative to said` pawl arm.

12. A stapling machine comprising a main frame body, a pawlarm-pivoted at its rear end 'to the rear end fof the body, a plunger slidably mounted at the 'front of the body, afleverpivoted fto the 'body-rearwardly of thefplunger, a handle lpivoted kat lits ffront end Lto lthe front upper end lof the body, said leverhaving a Vrearwardly ex- `tending arm and a forwardly extending arm, means including .an upper link interconnecting the rearwardly extending Varm with the handle, -a lower link interconnecting lthe forwardly extending arm of the lever with'the pawl arm, -a

lpawl pivoted to said pawl Von the pivotal point betweenthev link andthe pawl arm, said rpawlhaving `a forwardly extending arm and fa ,rearwardly extending ann, l-rneans on vthe -for- .wardly extending armof said'pawl'vto releasably engage said plunger, and means on the body 'to engage the rearwardly extending arm of said pawl .upon depressingthehandie `towards the body to .disengage the forwardly extending arm of said ,pawl with respect 'to said plunger.

13. A stapling machine comprising a main ,frame body, a pawl arm pivoted at its rear end tto Vthe rear end of kthe body, `a plunger slidably 4mounted at the front of thezbody, a .lever pivoted to the body rearwardly of the plunger, a handle pivotedat its :frontend to the -rfront upper end of vthe body, said lever ,having a' rearwardly extending `arm and a. vforwardly ,extending arm, Vmeans vincluding an upper linkk interconnecting 'the rearwardly extending armwith the handle, a'lower link Vinterconnecting the forwardly extendingy arm vof the lever with the pawlarm, a pawl pivotedto said pawl arm `on the :pivotal pointbetween the link and the pawl arnnsaid pawl having a forwardly extending arm and a rearwardly extend- 'ing arm, means on the forwardly extending arm of said pawl to releasably engage said plunger, means on the body to engage the rearwardly extending arm of said pawlupon depressing the handle towards the body to disengage the forwardly extending larmof said pawl with respect 'to said plunger, the rearwardly extending arm of ksaid pawl being .greaterin length than the e,for-

wardly extending 'arm of said vpawl.

20 -,1`4.5A fstapling machine `comprising :a-main frame'body, a .pawl Varm .-pivoted 'at .its rear :.enid lto-,thejrear lend of the Ybody, a'plungerslidably mounted at :the jfront of the body, 'a lever :pivio'ted Lto k:the `body rearwardly o--it-he plunger, a

handle ipivoted :at :its fronty end .to the .front i upper end of lthe body, said lever having iasrear- `wardly:extending.arm and a `forwardly:extending arm, means including an upper link interconnect- 'ing 'they rearwardly extendingfarm Iwith the han- -dle, a lower 'link :interconnecting fthe forwardly extending :arm of the `,lever :with :the -pawlrarmza :pawllpivotedito said pawl armfonthe pivotal point be'tween the link ,andthe pawl arm, ssaid pawl having a Yforwardly :extending armY and :a reariwardly 'extending arm, means on 'the r"forwardly extending, armrof -said .pawlV to releasably aengage lsaid plunger, means on the body to .engage :the rearwardly .extending arm of said .pawl upon -:de--

'pressing the handle ftowardsthe body 'to disen- .gage the forwardiyfextending arm of `saidpawl with respectLtovsaid zplunger, the rearwardly'ex- :tendingarrn of said pawlbeing greater inlength than .the forwardly :extending v arm of said pavil, the forward endof said leverfbeingmovableifrom 1a :point horizontally ,below the pivotal point of the lever to a point :above 'the .pivotal pointof the lever upon depressingsaid handle towards said body.

15. A stapling lmachine comprising la :main tframe body, a pawlrarm-pivotedrat its rear 'end to the rear fend l`of fthe body, a plunger slidably .finounted at the :front f of the body, .fa lever pivoted to the body rearwardly of the plunger, a handle :.pivoted atits front endtto the frontupper-:end of fthe body, 'said lever having a rearwardly :extending arm and a forwardly extending arm, 'means lincluding an upper'link interconnecting the rearwardly vextending arm ,with the handle, a `'lower link interconnecting the forwardly extendingarm ofthe lever with `the pawlfarin, a pawlpivoted to fsaid pawl arm onithe 4pivotal point `between vthe link Vand Ithe 4nav/l -.arm, said `navel 'having a for wardly :extending arm yand -a rearwardly extending `arm,rneans on the forwardly extending arin ol said pawl to release-bly engage said plunger, means on the 'body toerigage 4the .rearwardly `extending arm of said pawl upon depressing the vhandle towards the body to 4disengage the .forwardly extending arm of said pawl with respect to said plunger, the rearwardly extending armfof said fpawl being greater in length than the for.- wardly extending arm of said pawl, the forward vend of said lever being movable from a point horizontally below the pivotal point ofthe lever to a point `above the pivotal point of the lever upon Adepressing said 4handle towards said body, and spring means to move the rearwardly extending arm of said pawlinto engagement with said paw'l arm.

16. -A `stapling machine vlcompr1s1fng a main vfranie'body, a pawl arm pivoted at its rear eno to the rear end of thebody, -a plunger slidably mounted at the front of the body, a lever pivoted T to the body rearwardly of the plunger, a handle pivoted at its front end to the front upper end of the body, said lever having 'a rearwardly ex tending arm and a forwardly extending arm, means including an upper link interconnecting the rearwardly extending arm with the handle, a lower link interconnecting the forwardly extending arm of the lever with the pawl arm, a pawl pivoted to said paw] arm on the pivotal point between th'elinlt and the pawl arm,said pawllhav- .ing a forwardly extendingarm anda rearwardly 21 extending arm, means on the forwardly extending arm of said pawl to releasably engage said plunger, means on the body to engage the rearwardly extending arm of said pawl upon depressing the handle towards the body to disengage the forwardly extending arm of said pawl with respect to said plunger, the rearwardly extending arm of said pawl being greater in length than the forwardly extending arm of said pawl, the forward end of said lever being movable from a point horizontally below the pivotal point of the lever to a point above the pivotal point of the lever upon depressing said handle towards said body, and spring means to move the rearwardly extending arm of said pawl into engagement with said pawl arm, said plunger having a hook formed with an underedge engaging the forwardly extending arm of said pawl, and said underedge having a radius of curvature, the center of which is the pivotal point of the pawl relative to said pawl arm.

FRANK S. BOROUGHS.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 220,933 McGill Oct. 28, 1879 1,978,983 Baur Oct. 30, 1934 2,073,819 Vogel Mar. 16, 1937 2,239,935 Scherman Apr. 29, 1941 2,303,219 Moe Nov. 24, 1942 2,343,263 Pankonin Feb. 29, 1944 2,361,483 Lang Oct. 31, 1944 2,427,156 Percuoo Sept. 9, 1947 2,466,551 Maynard Apr. 5, 1949 2,472,032 Wandel May 31, 1949 2,524,061 Lindstrom Oct. 3, 1950 2,545,372

Morberg Mar. 13, 1951 

